Clean the area around the tear with a mild detergent and damp sponge. Remove any grease spots or soil, wiping in the direction of the tear, using caution to avoid elongating the tear or tugging at the loose section. Lift the tear and carefully clean the surface of the wall behind the torn segment. Rinse your sponge with clear water and wipe off any soapy residue.
Apply wallpaper seam adhesive to the underside of the torn paper. Use a small artist’s brush to carefully brush on a thin layer of the adhesive to the lifted portion. Press the section back into its original position.
Roll the wallpaper roller over the glued portion, moving it in the direction of the tear to avoid lifting or bunching the section. Wipe the wall with a damp sponge to remove any excess seam adhesive.
Replace the damaged section in areas with extensive tears. Long, ragged tears, as well as ones that result in missing pieces of wallpaper, require patching. Use a sharp utility knife to cut out around the damaged paper.
Cut a patch out of fresh wallpaper, matching the pattern edges of the patch to the pattern edges on the wall.
Peel off any remaining fragments or glue particles from the wall surface. Wipe the wall with a damp sponge.
Apply wallpaper adhesive to the back of the patch. Press the patch in place, lining up the pattern along the edges. Press the patch in place with a wallpaper roller, working the roller from the middle of the patch outwards. Remove the adhesive around the edges of your patch with a damp sponge.